WO2013170529A1

WO2013170529A1 - Multimode terminal and service implementation method for multimode terminal

Info

Publication number: WO2013170529A1
Application number: PCT/CN2012/078475
Authority: WO
Inventors: 胡秋林; 何莉媛
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-05-14
Filing date: 2012-07-11
Publication date: 2013-11-21
Also published as: US20150105074A1; US9467936B2; EP2852219A1; HK1207787A1; CN107529208A; CN102857999A; EP2852219A4

Abstract

Disclosed are a multimode terminal and a service implementation method for the multimode terminal. The multimode terminal comprises a main controller, an auxiliary controller, a user identification card, a first radio frequency chip, a first antenna, a second radio frequency chip and a second antenna. The main controller comprises a main processor and a first processing chip of a first network-system-type, wherein the main processor is used for selecting a network system type for executing the current service, and calling the network-system-type processing chip to execute the current service; the first processing chip of the first network-system-type is connected with the first antenna through a first radio frequency chip, and is used for executing communication between the multimode terminal and the network side of the first network system type in the first network-system-type network; the auxiliary controller comprises a second processing chip of a second network-system-type and a user identification card, wherein the second processing chip of the second network-system-type is connected with a second antenna through a second radio frequency chip, and is used for executing the communication between the multimode terminal and the network side of the second network system type in the second network-system-type network; and the user identifying card is respectively connected with the main controller and the auxiliary controller. According to the invention, the network resources can be utilized fully.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a service implementation method for a multimode terminal and a multimode terminal. BACKGROUND With the development of 3G networks, 3G users are more and more, and various operators around the world have begun to deploy 4G networks. The reality is that 2G users are still the majority of current end users, and therefore, most of them User data is still carried under the 2G network, which results in a very busy 2G network in most of the time, while the resources of the 3G/4G network are very idle. At present, although a terminal device can integrate multiple network standards, basically different network standards correspond to different user identification cards, and since each user identification card is separately charged, the user initiates using one of the user identification cards. In business, you cannot switch to the network format corresponding to another user ID card. Therefore, network offloading of various services cannot be realized, and various network resources cannot be utilized to the maximum extent. SUMMARY OF THE INVENTION The present invention provides a service implementation method for a multimode terminal and a multimode terminal to solve the above problems at least for the problem that the network offloading of various services cannot be realized in the related art and the network resources cannot be utilized to the maximum extent. According to an aspect of the present invention, a multimode terminal is provided, comprising: a main controller, a slave controller, a subscriber identity card, a first radio frequency chip and a first antenna, a second radio frequency chip, and a second antenna. The main controller includes: a main processor, configured to select a execution system according to a preset network network selection policy corresponding to a service type of the current service of the multimode terminal, and a network status of the current environment of the multimode terminal The network system of the current service, the processing chip that invokes the network standard performs the current service, where the network standard includes: a first network standard and a second network standard, where the network standard record policy records the network standard The first processing chip of the first network system is connected to the first antenna through the first radio frequency chip, and is configured to execute the multimode terminal and the network in the network of the first network standard Communicating between the network side of the first network system; the slave controller includes: the second processing chip of the second network standard, connected to the second antenna by the second radio frequency chip, and configured to be in the network of the second network standard Performing communication between the multimode terminal and the network side of the second network standard; the user identification card, respectively Said main controller and said slave controller is connected, through the main controller residing in said first and said standard network and the second network controller from the network at the same The first radio frequency chip and the first antenna; the second radio frequency chip and the second antenna; wherein the first radio frequency chip and the first antenna and the first The two RF chips are independent of the second antenna. Preferably, the multimode terminal further includes: a wireless fidelity (WIFI) module and a third antenna connected to the WIFI module; wherein the WIFI module includes: the WIFI processing chip is connected to the main controller, and is configured to perform multimode Communication between the terminal and the WIFI network. Preferably, the multimode terminal further includes: a switch disposed between the user identification card and the main controller and the slave controller, configured to turn on or off the user identification card and the The connection between the primary controller or the secondary controller. Preferably, the first processing chip is further configured to perform communication between the multimode terminal and a network side of the third network standard. Preferably, the first network standard is one of a time division TD system network and a global mobile communication GSM network, and the third network standard is another one of a TD system network and a GSM network, and the second network standard is long term evolution. LTE network. According to another aspect of the present invention, a service implementation method for a multimode terminal is provided, which is applied to the multimode terminal, and the method includes: acquiring a preset service type of a current service with a multimode terminal. Corresponding network system selection policy, wherein the network system selection policy records a priority order of the network standard; according to the network condition of the current environment of the multimode terminal, selecting a network standard existing in the current environment And selecting, in the network system selection policy, a network system with the highest order; calling a processing chip corresponding to the selected network system of the multimode terminal, and executing the current service. Preferably, the service type includes: a data service, a video call service, or a voice service; and the network standard includes: a wireless fidelity WIFI network, a time division TD system network or a global mobile communication GSM network, and a long term evolution LTE network. Preferably, the priority order of the network system recorded in the network standard selection policy corresponding to the data service is: a WIFI network, an LTE network, and a TD system network or a GSM network; and a network standard selection corresponding to the video call service The priority order of the network system recorded in the policy is: LTE network, and TD system network or GSM network; the priority order of the network system recorded in the network standard selection policy corresponding to the voice service is: TD system network or GSM Network, and LTE network. Preferably, in the case that the multi-mode terminal initiates a data service, according to the network condition of the current environment of the multi-mode terminal, selecting a network standard existing in the current environment, in the network system selection policy The network system with the highest priority is selected, including: determining whether there is a WIFI network in the current environment, and if so, selecting a WIFI network; if there is no WIFI network in the current environment, determining the multimode terminal Whether the subscriber identity card resides on the LTE network, and if so, determines that there is an LTE network in the current environment, and selects the LTE network; if the LTE network does not exist in the current environment, the TD system network or the GSM network is selected. Preferably, in the case that the multi-mode terminal initiates or receives a video call service, according to the network condition of the environment in which the multi-mode terminal is currently located, selecting a network system existing in the current environment, in the network Determining the highest priority network standard in the system selection policy, including: determining whether the user identification card of the multimode terminal resides on the LTE network, and if yes, determining that an LTE network exists in the current environment, and selecting an LTE network; If there is no LTE network in the current environment, the TD system network or the GSM network is selected. With the present invention, the user identification card of the multi-mode terminal can reside in multiple network systems at the same time by multiple controllers. When the terminal performs the service, the user can select the strategy and the current system according to the network standard corresponding to the service type of the current service. The network status of the environment, select the network standard for executing the current service, and call the corresponding baseband processing chip to execute the current service, thereby avoiding that all services are executed in the same network standard, causing some network resource congestion and another network resource to be idle. The problem is to maximize the use of network resources of various network standards while realizing user needs. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a schematic structural view of a multimode terminal according to an embodiment of the present invention; FIG. 2 is a schematic structural view of a multimode terminal according to a preferred embodiment of the present invention; FIG. 3 is a schematic diagram of a multimode terminal according to a preferred embodiment of the present invention; FIG. 4 is a schematic structural diagram of a multimode terminal according to another preferred embodiment of the present invention; FIG. 5 is a flowchart of a service implementation method of a multimode terminal according to an embodiment of the present invention; A flowchart of actively initiating a service by a multimode terminal in an embodiment of the invention; FIG. 7 is a flowchart of a passive receiving service of a multimode terminal according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. 1 is a schematic structural diagram of a multimode terminal according to an embodiment of the present invention. As shown in FIG. 1, the multimode terminal includes: a main controller 2, a slave controller 4, a user identification card 6, a first radio frequency chip 8, and a first An antenna 10, a second RF chip 12 and a second antenna 14. The above various sections are described below. As shown in FIG. 1, the main controller 2 includes: a main processor 22, configured to select a policy according to a preset network type corresponding to a service type of a current service of the multimode terminal, and a current environment of the multimode terminal. The network system, the network system that performs the current service is selected, and the processing chip of the network system is invoked to execute the current service, where the network standard includes: a first network standard and a second network standard, the network standard The priority selection order of the network standard is recorded in the selection policy; the first processing chip 24 (also referred to as a baseband processing chip) of the first network standard is connected to the first antenna 10 through the first radio frequency chip 8 and is set to be in the first In the network system network, communication between the multimode terminal and the network side of the first network standard is performed. From the controller 4, the second processing chip 40 (also referred to as a baseband processing chip) of the second network system is connected to the second antenna 14 through the second radio frequency chip 12, and is disposed in the network of the second network standard. And performing communication between the multimode terminal and the network side of the second network standard. The subscriber identity card 6, which is connected to the master controller 2 and the slave controller 4, respectively, resides in the network of the first network system and the network of the second network system by the master controller 2 and the slave controller 4. In the embodiment of the present invention, the first radio frequency chip 8 and the first antenna 10 are configured to implement data transmission and reception of the multimode terminal in the first network standard, and the second radio frequency chip 12 and the second antenna 14 are configured to implement the multimode terminal. Data transmission and reception of the second network standard. Moreover, in the embodiment of the present invention, the first radio frequency chip 8 and the first antenna 10 are independent of the second radio frequency chip 12 and the second antenna 14. With the above multimode terminal provided by the embodiment of the present invention, the multimode terminal has only one user identification card 6, and both the main controller 2 and the slave controller 4 can operate it. Therefore, in normal use, the user identification card 6 can reside in the first network standard and the second network system simultaneously by the master-slave controller. Therefore, when the multi-mode terminal performs the service, the main controller 2 can according to the service type of the current service and the network where the multi-mode terminal is located. Environment, selecting a processing chip of one of the first network standard or the second network standard to execute the current service, thereby being implemented At the same time of the user's needs, the network resources of each network are maximized, and the problem of insufficient network resources caused by the execution of all services in the same network is avoided, and the utilization of network resources is improved. In the embodiment of the present invention, different service types may be configured with different network standard selection policies, so that various types of services can select an optimal link for execution. In a preferred embodiment of the present invention, in order to facilitate the transmission of data services, as shown in FIG. 2, the multimode terminal may further include: a wireless fidelity (WIFI) module 16 and a third connection with the WIFI module 16. The antenna 18 includes: a WIFI processing chip, connected to the main controller 2, and configured to perform communication between the multimode terminal and the WIFI network. In the preferred embodiment, for the data service, the network standard selection policy corresponding thereto may be set to preferentially select the WIFI network. Therefore, when the multi-mode terminal initiates the data service, the main controller 2 invokes the WIFI processing chip of the WIFI module 16. The data service is executed, thereby improving the transmission efficiency of the data service and saving the user. In another preferred embodiment of the present invention, as shown in FIG. 3, the multimode terminal may further include: a switch 20 disposed between the subscriber identity card 6 and the master controller 2 and the slave controller 4, To turn on or off the connection between the subscriber identity card 6 and the master controller 2 or the slave controller 4. In the preferred embodiment, after selecting the network system for performing the current service, the main controller 2 may trigger the switch 20 to open the connection between the controller where the baseband processing chip of the network standard is located and the user identification card 6, and The connection between the subscriber identity card 6 and another controller is disconnected. In the above preferred embodiment, the first baseband processing chip 24 can integrate the modulation and demodulation functions of the two network standards. Therefore, in another preferred embodiment of the embodiment of the present invention, the first baseband processing chip 24 is further configured to execute more. The mode terminal communicates with the network side of the third network system. In the above preferred embodiment of the embodiment of the present invention, the first network standard may be one of a time division (TD) system network and a global mobile communication (GSM) network, and the third network standard may be another in the TD system network and the GSM network. One, that is, the first baseband processing chip 24 can implement TD and GSM modulation and demodulation functions; the second network standard can be a Long Term Evolution (LTE) network. 4 is a schematic structural diagram of a multimode terminal according to a preferred embodiment of the present invention. As shown in FIG. 4, the multimode terminal in the preferred embodiment may include the following functional modules:

(1), various common modules on the current terminal, such as LCD display or touch screen 1, camera 2, etc.;

(2) Main control module 3 (equivalent to the above-mentioned main controller): This module contains the main processor of the intelligent machine, and integrates TD/GSM Modem (ie TD/GSM network standard baseband processing) in the main processor. chip), This module has separate RF chips 11 (ie PA and transceiver) and antenna 12, so that the subscriber identity card 6 can reside on the TD or GSM network; since the module implements the functions of the TD/GSM network system, it can also It is called TD/GSM module.

(3), from the control module 4 (corresponding to the above slave controller): This module mainly includes LTE Modem (ie baseband processing chip of LTE network standard), has a separate radio frequency chip 13 and antenna 14, so that the user identification card 6 It can reside on the LTE network; since this module implements the functions of the LTE network standard, it can also be called an LTE module.

(4) WIFI module 5: This module contains the WIFI chip (the above WIFI processing chip) and a separate antenna. 15. In a network with WIFI, the terminal can access the Internet through WIFI. (5) User identification card 6: This multimode terminal has a user identification card, and both the main control module 3 and the slave control module 4 can operate it. In normal use, the user identification card 6 can pass the master and slave cards. The control module resides on both TD/GSM and LTE networks. As shown in Fig. 4, the subscriber identity card 6 can be switched between the master control module 3 and the slave control module 4 via the switch 7. The following describes the service implementation manner of the multimode terminal in the preferred embodiment by taking the active mode and the passive receiving service of the multimode terminal as an example.

(1) The multi-mode terminal initiates the service process as the master device: When the user initiates the operation service, the main control module 3 can complete the corresponding network resource by determining whether it is a data service, a videophone or a voice service. For example, when the user initiates the data service, the main control module 3 first determines whether there is a WIFI network in the scope of the belonging, and if so, implements the data service requirement of the user through the WIFI module 5. If there is no WIFI network in the scope, it is determined whether the subscriber identity card 6 resides on the LTE network. If yes, it indicates that the LTE network exists currently, and the data service requirement of the user is implemented by the control module 4; In the LTE network, the data service is implemented in the TD/GSM network through the main control module 3. When the user initiates the videophone service, the main control module 3 first determines whether the LTE network resides in the scope of the LTE network, and if the LTE network is available, the videophone service requirement of the user is implemented by the control module 4; There is also no LTE network, and the videophone service is implemented through the network of the main control module 3. 3 When a user initiates a voice service, since the voice service consumes a small amount of network resources, it is directly implemented through the TD/GSM control module network. The terminal receives the business process as a slave device: When the user receives the external service, the main control module 3 can complete the corresponding network resource by determining whether it is a videophone or a voice service. For example, when the terminal receives the service and receives the service through the main control (TD/GSM) module and the slave controller (LTE) module respectively, and the main control module 3 determines that it is a videophone service, the LTE module is called (ie, the slave control) Module 4), and the LTE network in this area, realizes the videophone service from the control module 4, if there is no LTE network in the area, realizes the videophone service through the main control module; 2 when the terminal receives the voice service, Directly through the main control module. According to an embodiment of the present invention, a service implementation method for a multi-mode terminal is further provided, which is applied to the foregoing multi-mode terminal provided by the embodiment of the present invention. FIG. 5 is a flowchart of a service implementation method of a multimode terminal according to an embodiment of the present invention. As shown in FIG. 5, the method mainly includes the following steps S502 to S506. In step S502, a network system selection policy corresponding to the service type of the current service of the multimode terminal is obtained, where the network system selection policy records the priority selection order of the network standard. Step S504: Select, according to the network condition of the environment in which the multimode terminal is currently located, the network system with the highest priority in the network system selection policy existing in the current environment. Step S506, the processing chip corresponding to the selected network standard of the multimode terminal is invoked, and the current service is executed. In a preferred embodiment of the present invention, the foregoing service type includes, but is not limited to, a data service, a video call service, or a voice service; the network standard includes but is not limited to: a wireless fidelity (WIFI) network, a time division (TD) System network or Global System for Mobile Communications (GSM) networks, and Long Term Evolution (LTE) networks. In a preferred embodiment of the embodiment of the present invention, the following network standard selection policies may be set for each of the foregoing service types:

(1) The priority order of the network standard recorded in the network standard selection policy corresponding to the data service is: WIFI network, LTE network, and TD system network or GSM network;

(2) The priority order of the network system recorded in the network standard selection policy corresponding to the video call service is: LTE network, and TD system network or GSM network;

(3) The priority order of the network system recorded in the network standard selection policy corresponding to the voice service is: TD system network or GSM network, and LTE network. In the above preferred embodiment, in the case that the multimode terminal actively initiates the data service, according to the network condition of the environment in which the multimode terminal is currently located, the network standard existing in the current environment is selected, and the network standard is The network system with the highest priority in the selection policy may include the following steps: Step 1: Determine whether there is a WIFI network in the current environment, and if yes, select a WIFI network; Step 2, if not in the current environment If there is a WIFI network, it is determined whether the user identification card of the multimode terminal resides on the LTE network, and if yes, it is determined that an LTE network exists in the current environment, and the LTE network is selected; Step 3, if currently in the environment If there is no LTE network, the TD system network or the GSM network is selected. In the above preferred embodiment, in the case that the multi-mode terminal initiates or receives the video call service, according to the network condition of the environment in which the multi-mode terminal is currently located, the network system existing in the current environment is selected, The network system with the highest priority in the network system selection policy may include the following steps: Step 1: Determine whether the user identification card of the multimode terminal resides on the LTE network, and if yes, determine the current environment. There is an LTE network, and an LTE network is selected; Step 2: If there is no LTE network in the current environment, the TD system network or the GSM network is selected. In order to further illustrate the foregoing technical solutions provided by the embodiments of the present invention, the following describes an example in which a multimode terminal actively initiates a service and a passive receiving service. In the following embodiments, the service types include: data service, video call service, and voice service; the network standard includes: a wireless fidelity (WIFI) network, a time division (TD) system network, or a global mobile communication (GSM) network, and Long Term Evolution (LTE) network. Embodiment 1 In this embodiment, a multimode terminal actively initiates a service process as a master device. As shown in FIG. 6, the service implementation process of the multimode terminal in this embodiment mainly includes the following steps. Step 601: The user initiates a service by operating the terminal device. Step 602, the terminal device determines whether the service type of the service is a data service, a videophone service, or a voice service. If it is a data service, step 603 is performed. If it is a videophone service, step 605 is performed. Then step 607 is performed. Step 603: The terminal device determines whether there is a WIFI network in the current scope. If yes, step 604 is performed. Otherwise, step 605 is performed. Step 604: The terminal device implements a current service requirement of the user by using a WIFI module. Step 605: The terminal device determines whether the user identification card is camped on the LTE network. If yes, the LTE network is in the current environment, and step 606 is performed. Otherwise, step 607 is performed. Step 606: The terminal device implements a current service requirement of the user by using a slave controller (LTE) module. Step 607: Implement a current service through a network of a main controller (TD/GSM) module. Embodiment 2 In this embodiment, the terminal receives the service as the slave device. FIG. 7 is a flowchart of the service implementation of the terminal device in the embodiment. As shown in FIG. 7 , in this embodiment, the service implementation of the terminal device mainly includes The following steps are as follows: Step 701: The main control module of the terminal device receives the service from the control module. Step 702: The terminal device determines whether the current service is a videophone service or a voice service. If it is a videophone service, step 703 is performed. If the voice service is voice, go to step 705; Step 703, determine whether there is an LTE network in the current environment, if yes, go to step 704, otherwise, go to step 705; Step 704, call the slave device of the terminal device (ie, the LTE network) The corresponding controller executes the current service; Step 705, the current service is executed by the main control (TD/GSM) module. In this embodiment, when the terminal receives the service, and receives the service through the main control TD/GSM module and the slave controller LTE module respectively, and determines that it is a videophone, the LTE module is called, and if the area has an LTE network, the The videophone service is implemented from the control LTE module. If there is no LTE network in this area, the videophone service is implemented by the main control TD/GSM module; when the terminal receives the voice service, it is directly implemented by the main control TD/GSM module. From the above description, it can be seen that, by using one or more embodiments of the foregoing embodiments of the present invention, when the terminal operates the service, the terminal allocates the optimal link according to the initiated service and the network condition of the geographical location. The network resources that are suitable for the data service are not fully utilized, and the network resources suitable for the voice service are continuously utilized, causing the network to be too busy and causing congestion; while realizing the user's needs, maximizing the use of various network resources. performance. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. A multimode terminal, comprising:

The main controller, including:

The main processor is configured to select a network standard that performs the current service according to a preset network network selection policy corresponding to a service type of the current service of the multimode terminal, and a network status of the current environment of the multimode terminal, Calling the processing chip of the network system to execute the current service, where the network standard includes: a first network standard and a second network standard, where the network system selection policy records a priority order of the network standard;

The first processing chip of the first network system is connected to the first antenna by using the first radio frequency chip, and is configured to perform, in the network of the first network standard, the multimode terminal and the first network standard. Communication between network sides;

The slave controller, comprising: the second processing chip of the second network system, connected to the second antenna by the second radio frequency chip, configured to execute the multimode terminal and the network in the network of the second network standard Communicating between network sides of the second network standard;

a subscriber identity card, respectively connected to the master controller and the slave controller, wherein the master controller and the slave controller simultaneously reside in the network of the first network standard and the second network standard In the network;

The first radio frequency chip and the first antenna;

The second radio frequency chip and the second antenna;

The first radio frequency chip and the first antenna are independent of the second radio frequency chip and the second antenna.

The multimode terminal according to claim 1, wherein the multimode terminal further comprises: a wireless fidelity WIFI module and a third antenna connected to the WIFI module;

The WIFI module includes: a WIFI processing chip, connected to the main controller, configured to perform communication between the multimode terminal and a WIFI network.

The multimode terminal according to claim 1, wherein the multimode terminal further comprises: a switch disposed between the user identification card and the main controller and the slave controller, configured as a guide Passing or disconnecting the subscriber identity card from the master controller or the slave controller.

The multimode terminal according to any one of claims 1 to 3, wherein the first processing chip is further configured to perform communication between the multimode terminal and a network side of a third network system.

The multimode terminal according to claim 4, wherein the first network standard is one of a time division TD system network and a global mobile communication GSM network, and the third network standard is a TD system network and a GSM network. In another example, the second network standard is a long term evolution LTE network.

A service implementation method for a multimode terminal, which is applied to the multimode terminal according to any one of claims 1 to 5, the method comprising:

Obtaining a pre-set network system selection policy corresponding to the service type of the current service of the multi-mode terminal, where the network system selection policy records the priority selection order of the network standard;

Determining, according to the network condition of the environment in which the multimode terminal is currently located, the network system having the highest priority in the network system selection policy currently existing in the environment; calling the multimode terminal The processing chip corresponding to the selected network system performs the current service.

The method according to claim 6, wherein the service type comprises: a data service, a video call service, or a voice service; and the network standard comprises: a wireless fidelity WIFI network, a time division TD system network or a global mobile communication GSM network, and long-term evolution LTE network.

The method according to claim 7, wherein the priority order of the network system recorded in the network standard selection policy corresponding to the data service is: a WIFI network, an LTE network, and a TD system network or a GSM network; The priority order of the network system recorded in the network standard selection policy corresponding to the video call service is: an LTE network, and a TD system network or a GSM network;

The priority order of the network system recorded in the network standard selection policy corresponding to the voice service is: a TD system network or a GSM network, and an LTE network.

The method according to claim 8, wherein, in the case that the multimode terminal initiates a data service, selecting a network standard existing in the current environment according to a network condition of the environment in which the multimode terminal is currently located The network system having the highest order is preferentially selected in the network system selection policy, including: determining whether a WIFI network exists in the current environment, and if yes, selecting a WIFI network; If there is no WIFI network in the current environment, it is determined whether the user identification card of the multimode terminal resides on the LTE network, and if yes, it is determined that an LTE network exists in the current environment, and the LTE network is selected;

If the LTE network does not exist in the current environment, select the TD system network or the GSM network. The method according to claim 8, wherein, in a case where the multimode terminal initiates or receives a video call service, according to a network condition of an environment in which the multimode terminal is currently located, selecting a current presence in the environment In the network standard, the network system with the highest order is preferentially selected in the network system selection policy, including:

Determining whether the user identification card of the multimode terminal resides on the LTE network, and if yes, determining that an LTE network exists in the current environment, and selecting an LTE network;

If the LTE network does not exist in the current environment, select the TD system network or the GSM network.